.lt_container{
  background-color: #fff;
}

.left_first{
  width: 90px;
  height: 100%;
  float: left;
  
  position: relative;
  li{
    height: 50px;
    border-right: 1px solid red;
    border-bottom: 1px solid red;
    text-align: center;
    line-height: 49px;
    background-color: pink;
    &.now{
      background-color: #fff;
      border-right:none;
    }
    a{
      font-size: 16px;
      display: block;
    }
  }
}

.right_second{
  overflow: hidden;
  height: 100%;
  position: relative;
  li{
    width: 33.33%;
    float:left;
    text-align: center;
    a{
      display: block;
      img{
        width: 62px;
        height: 62px;
      }
    }
  }
}